Powershell Cmdlet: Determine actual filepath of file in local directory

Question

I have a custom cmdlet that can be called like this:

Get-Info ".\somefile.txt"

My commandlet code looks something like this:

[Parameter(Mandatory = true, Position = 0)]
public string FilePath { get; set; }

protected override void ProcessRecord()
{
    using (var stream = File.Open(FilePath))
    {
        // Do work
    }
}

However when I run the command, I get this error:

Could not find file 'C:\Users\Philip\somefile.txt'

I'm not executing this cmdlet from C:\Users\Philip. For some reason my cmdlet doesn't detect the working directory so local files like this don't work. In C#, what is the recommended way of detecting the correct filepath when a local ".\" filepath is provided?

Answer 1

For now I am using GetUnresolvedProviderPathFromPsPath. However I could design my cmdlet a little more according to Microsoft guidelines with the help of this stackoverflow question, which is exactly what I am looking for. The answer there is extremely comprehensive. I don't want to delete this quesion, but I have voted to close it as this question is an exact duplicate and the answer there is better.

Answer 2

Look at the Path property of the SessionState property. It has some utility functions commonly used to resolve a relative path. The choices vary depending on whether you want to support wildcards. This forum post might be useful.

Answer 3

Have you tried:

File.Open(Path.GetFullPath(FilePath))

Answer 4

You should be able to use something like:

var currentDirectory = ((PathInfo)GetVariableValue("pwd")).Path;

If you inherit from PSCmdlet instead of Cmdlet. Source

Alternatively, something like:

this.SessionState.Path

might work.

Answer 5

    /// <summary>
    /// The member variable m_fname is populated by input parameter
    /// and accepts either absolute or relative path.
    /// This method will determine if the supplied parameter was fully qualified, 
    /// and if not then qualify it.
    /// </summary>
    protected override void InternalProcessRecord()
    {
        base.InternalProcessRecord();

        string fname = null;
        if (Path.IsPathRooted(m_fname))
            fname = m_fname;
        else
            fname = Path.Combine(this.SessionState.Path.CurrentLocation.ToString(), m_fname);

        // If the file doesn't exist
        if (!File.Exists(fname))
            throw new FileNotFoundException("File does not exist.", fname);
    }